<extension
point="org.eclipse.ui.popupMenus">
<viewerContribution
id="com.duanf.trying.sampleViewerContribution"
targetID="org.eclipse.jdt.ui.PackageExplorer">
<menu
id="com.duanf.trying.samplePopupMenu"
label="Sample PopupMenu"
path="additions">
<groupMarker name="content" />
</menu>
<action
id="com.duanf.trying.viewerActionTest"
label="Sample Viewer Operation"
class="com.duanf.trying.actions.SampleViewerAction"
menubarPath="com.duanf.trying.samplePopupMenu/content">
</action>
</viewerContribution>
</extension>
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This code worked correctly,but it did not work when I set the targetID as VIEWA's ID which is an extension view created by me.